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NEW YORK - In a spectacular turnabout, hospitals are treating almost all major heart attack patients within the recommended 90 minutes of arrival, a new study finds. Just five years ago, less than half of them got the patients’ clogged arteries opened that fast.

The time it took to treat such patients plunged from a median of 96 minutes in 2005 to only 64 minutes last year, researchers found.

Some hospitals are moving at warp speed: Linda Tisch was treated in a mere 16 minutes after she was stricken while visiting relatives near Yale-New Haven Hospital in Connecticut this month. Emergency responders called ahead to mobilize a team of heart specialists.

Once she arrived, “they had a brief conversation, and I went straight into the OR. My family was absolutely flabbergasted,’’ said Tisch, 58, who went home to Westerly, R.I., two days later.

Tisch’s case was not a fluke. The hospital took 26 minutes on another stricken patient Thursday.

“Americans who have heart attacks can now be confident that they’re going to be treated rapidly in virtually every hospital of the country,’’ said a Yale cardiologist, Dr. Harlan Krumholz. He led the study, published online yesterday by an American Heart Association journal, Circulation.

What is remarkable about this improvement, Krumholz said, is that it occurred without money incentives or threat of punishment.

Instead, the government and a host of private groups led research on how to shorten treatment times and started campaigns to persuade hospitals that this was the right thing to do.

Heart attacks are caused by clogged arteries that prevent enough oxygen and blood from reaching the heart. Each year, about 250,000 people in the United States and more than 3 million worldwide suffer a major one, where a main artery is completely blocked.

The best remedy is angioplasty, in which doctors push a tube through an artery to the clog, inflate a tiny balloon to flatten it, and place a mesh prop called a stent to keep the artery open.